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M-45 over Bass River

Ottawa County, Michigan · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

M-45 over Bass River in Ottawa County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1929 and reconstructed in 2000, making it 96 years old at the 2025 inventory.
It carries about 8,591 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 151 of the 253 inventoried bridges in Ottawa County rated fair (59.7%); 23 (9.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 40 ft
Location	7.7 Mi E of US-31
NBI structure number	000000000008760
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.

Bridge	Built	Vehicles/day	Condition
Taft Rd over US-31	1958	281,500	Fair
US-31 over Grand River M-104 Conn	1960	66,750	Fair
US-31 over Gtw RR & M-104	1959	44,375	Fair
US-31 over 3RD St (m-104)	1958	44,375	Fair
I-96 over Br of Sand Creek	1961	36,338	Good
I-96 EB over Deer Creek	1958	36,000	Fair